Fours.

Fours is a game similar to Sudoku. New rules and gameplay bring you a different experience

--- Every row and column must contain each number exactly once

--- The numbers must follow the rules of their cage

--- A bolded region is called a cage. Each cage has an operator and target in the upper left corner. The values inside the cage must use the operator to make the target number.

Note: Numbers may be repeated within the same cage, so long as they are in different rows and columns.